Elasticsearch与Linux(第八天)-java在IDEA下操作es (1)

一. 环境配置

1. IntelliJ IDEA 2018.2
2. java1.8
3. Maven3

二. 创建项目

1.创建一个maven项目，并配置es的maven环境

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>6.3.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>transport</artifactId>
    <version>6.3.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.plugin</groupId>
    <artifactId>transport-netty4-client</artifactId>
    <version>6.3.0</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

2.创建完成的目录

三. java操作es

1.连接es服务器

    private TransportClient client;

    @Before
    public void init() throws UnknownHostException {
        //指定ES集群 
        Settings settings = Settings.builder().put("cluster.name", "my-application").build();

        //创建访问es服务器的客户端
        client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.239.53"), 9300));
    }

cluster.name为固定名称，my-application 到es服务器 elasticsearch-6.4.0/config/elasticsearch.yml

2.基本查询文档

    //从es中查询数据
    @Test
    public void search() {
        //数据查询
        GetResponse response = client.prepareGet("lib3", "user", "1").execute().actionGet();

        //得到查询到的数据
        System.out.println(response.getSourceAsString());

        client.close();

    }

2.添加文档

    /**
     * 添加文档
     */
    @Test
    public void insert() throws IOException {
        //添加文档
        XContentBuilder doc = XContentFactory.jsonBuilder()
                .startObject()
                .field("id", "1")
                .field("title", "java基础")
                .field("content", "java是面向对象的语言")
                .field("postdate", "2018-05-20")
                .field("url", "baidu.com")
                .endObject();

        //添加文档
        IndexResponse response = client.prepareIndex("index1", "blog", "10")
                .setSource(doc).get();

        System.out.println(response.status());
    }

3.删除文档

    /**
     * 删除文档
     */
    @Test
    public void delete() {

        // 删除文档
        DeleteResponse response = client.prepareDelete("index1", "blog", "10").get();

        System.out.println(response.status());

    }

4.更新文档

    @Test
    public void update() throws IOException, ExecutionException, InterruptedException {

        UpdateRequest request = new UpdateRequest();
        request.index("index1")
                .type("blog")
                .id("10")
                .doc(
                        XContentFactory.jsonBuilder().startObject()
                                .field("title", "C语言")
                                .endObject()
                );
        UpdateResponse response = client.update(request).get();

        System.out.println(response.status());
    }

4.upsert

    @Test
    public void upsert() throws IOException, ExecutionException, InterruptedException {

        IndexRequest request = new IndexRequest("index1", "blog", "8")
                .source(
                        XContentFactory.jsonBuilder().startObject()
                                .field("id", "2")
                                .field("title", "python基础")
                                .field("content", "python 爬虫")
                                .field("postdate", "2018-05-20")
                                .field("url", "baidu.com")
                                .endObject()

                );

        UpdateRequest request2 = new UpdateRequest("index1", "blog", "8")
                .doc(
                        XContentFactory.jsonBuilder().startObject()
                                .field("id", "3")
                                .field("title", "ruby基础")
                                .field("content", "ruby")
                                .field("postdate", "2018-05-20")
                                .field("url", "baidu.com")
                                .endObject()
                ).upsert(request);

        UpdateResponse response = client.update(request2).get();

        System.out.println(response.status());

    }

5.mget批量查询

    //mget批量查询
    @Test
    public void test() {
        MultiGetResponse responses = client.prepareMultiGet()
                .add("index1", "blog", "8", "10")
                .add("lib3", "user", "1", "2", "3")
                .get();
        for (MultiGetItemResponse item : responses) {
            GetResponse gr = item.getResponse();
            if (gr != null && gr.isExists()) {
                System.out.println(gr.getSourceAsString());
            }
        }
    }

6.bulk批量操作

    @Test
    public void bulk() throws IOException {
        BulkRequestBuilder bulkBuilder = client.prepareBulk();

        //批量添加
        bulkBuilder.add(
                client.prepareIndex("lib2", "books", "8")
                        .setSource(
                                XContentFactory.jsonBuilder()
                                        .startObject()
                                        .field("title", "python")
                                        .field("price", 99)
                                        .endObject()
                        )
        );
        bulkBuilder.add(
                client.prepareIndex("lib2", "books", "9")
                        .setSource(
                                XContentFactory.jsonBuilder()
                                        .startObject()
                                        .field("title", "R")
                                        .field("price", 89)
                                        .endObject()
                        )
        );

        BulkResponse responses = bulkBuilder.get();

        System.out.println(responses.status());
    }

7.批量删除

/**
     * 删除所有
     */
    @Test
    public void deleteAll() {

        BulkByScrollResponse response = DeleteByQueryAction.INSTANCE
                .newRequestBuilder(client)
                .filter(QueryBuilders.matchQuery("title", "基础"))
                .source("index1")
                .get();

        System.out.println(response.getDeleted());
    }

8.查询所有

    /**
     * 查询所有
     */
    @Test
    public void selectAll() {

        QueryBuilder gb = QueryBuilders.matchAllQuery();
        SearchResponse sr = client.prepareSearch("lib3")
                .setQuery(gb)
                .setSize(3)
                .get();
        SearchHits hits = sr.getHits();
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
    }